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E. WAGBMANN.

ARMATURE.

No. 432,500. Patented July 15, 139.0.-

UNITED STATES PATENT OFFICE.

EDMUND IVAGEMANN, OF LITTLE ROOIQARKANSAS, ASSIGNOR OF SIX-SEV- ENTIIS TO JOHN D. ADAMS, DEAN ADAIWIS, OSCAR DAVIS, J OIIN IV. DAVIS, HORACE G. ALLIS, AND JOHN B. JONES, ALL OF SAME PLACE.

ARMATU RE.

SPECIFICATION forming part of Letters Patent No. 432,500, dated July 15, 1890. Application filed September 24, 1889. Serial No. 324,972. (No model.)

To all whom, it may concern.-

Be it known that I, EDMUND WAGEMANN, a subject of the German Emperor, and a resident of Little Rock, county of Pulaski, and 5 State of Arkansas, have invented certain new and useful Improvements in Armatures, of which the following is a specification.

My present invention relates to an armature for a dynamo-electric machine or electric motor. Its object is to so construct a cylindrical ring-armature as to obtain simplicity of construction and efliciency of action.

The improvements relate to the mechanical details of construction, and can best be de- I scribed by reference to the accompanying drawings.

Figure l is a front elevation of the complete armature. Figs. 2, 3, and 4 are respectively views of three different sides of one of the coils of the armature, the insulation being omitted in Fig. 2. Fig. 5 shows, in an isolated condition, all the coils between any two arms or spokes of the armature. These views in Fig. 5 indicate by dotted lines the respect- 2 5 ive terminals of each coil. The dots between the convolutions represent insulation. Fig. 6 is a view of the armature hub and spokes or arms in front elevation. Fig. 7 is the same in side elevation. Fig. 8 isa view of the arma- 0 ture in front elevation, the coils being omitted. Fig. 9 shows one of the coils and insulating-strips partly evolved. Fig. 10 shows two arms of the coil. Fig. 11, A and B, shows the manner of connecting the commutator to 5 the inner ends of the armature-coils, only a portion of the coils being shown. Figs. 12 and 13 are front and side views of the single armature-coil by itself to show how the coil may be kept from unwrapping when the same is not of heavy metal and thick enough to stay rolled in any desired spiral.

The device consists of the combination of a hub a, having spokes or arms I), which contain in their outer extremities and on oppo- 5 site sides thereof a dovetail d and a rectangular groove c, (see Fi 7,) arc-shaped coilsupports f,eaeh having a dovetail projection g, fitting into one of the dovetail grooves (Z on one arm, and a rectangular projection h, fittinginto one of the rectangular grooves on an adjacent arm, tubes or spools 11, upon which are wound in a superposed manner sheets of metal j and strips of insulation Z, the sheets of metal being in each case one of the armature-coils, and the tubes, with their coils, be ing mounted upon the supports f, and sepa rated therefrom and from each other by insulation, the former insulation being indicated by m in strips and the latter by n in disks, and pins 19 for retaining the supports f upon the spokes b.

The operation of my armature is similar to that of other cylindrical ring-armatures. I find that it is especially elfective for use in alternating-current generators. The strips m are wound up with the coil, leaving an airspace, so that on both surfaces of the sheet is air in motion relatively to the moving armature. The air can enter and recede from the space between the strips and the coil or sheet itself. The ventilation takes place by convection. The coil-terminals q and 7' may be connected in circuit, either to form an open or closed coil armature, or in any other manner. The support-sf are secure against centrifugal force, as the pins 13 pass through grooves s in the ends of the supports and through holes in the spokes b. By the mere removal of the said pins the armature will fall apart into its elements, so that the same may be repaired or packed in a very compact manner.

The terminals 1 in Fig. 5 are only represented as to their position by dotted lines; but in Fig. 11, A and B, they are shown in full lines and pass to the interior of the coil by passing between two disks a, forming the insulation between the coils.

In Figs. 12 and 13 parallel rings of insulation a may be placed around the armaturecoils to prevent them unwrapping; but this is not necessary exceptin the case of small inachines.

I claim as my invention- 1. A cylindrical ring-armature consisting of the combination of a hub provided with spokes containing upon their outer ends and upon their opposite sides, respectively, a (lovetail and a rectangular groove, arc-shaped coilsupports having dovetail projections upon one end of each and fitting into said dovetail grooves, and rectangular projections upon the opposite end and fitting into said rectangular 5 grooves, the projections of both kinds having grooves in the same, and said spokes having holes, pins passing through said holes and grooves, and coils mounted upon said supports and separated from the same and from 10 one another by insulation.

2. In a cylindrical ring-armature, a spiral conductor-coil of sheet metal provided with spiral air-spaces.

In testimony that I claim the foregoing my invention 1 have signed my name, in pres- I 5 once of two witnesses, this Bid dayof August, 1889.

EDMUND \VA GEMANN.

\Vitnesses:

E. G. DUVALL, Jr., EDWARD I. THOMPSON. 

